SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc58eef9ad092a835fef370e3e47d07ba11c3b4c61f3e4928d629183c22c6e58' 
  AND token = 'hiKx6rnBljjbethXK+VoXJxqD8K6/G0gy/Tqf9OH6ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}